could topple
Regular verb: topple - toppled- toppled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could topple
you could topple
he could topple
we could topple
you could topple
they could topple 	I could be toppling
you could be toppling
he could be toppling
we could be toppling
you could be toppling
they could be toppling	I could have toppled
you could have toppled
he could have toppled
we could have toppled
you could have toppled
they could have toppled	I could have been toppling
you could have been toppling
he could have been toppling
we could have been toppling
you could have been toppling
they could have been toppling	

Negation 	
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I couldn't topple
you couldn't topple
he couldn't topple
we couldn't topple
you couldn't topple
they couldn't topple 	I couldn't be toppling
you couldn't be toppling
he couldn't be toppling
we couldn't be toppling
you couldn't be toppling
they couldn't be toppling	I couldn't have toppled
you couldn't have toppled
he couldn't have toppled
we couldn't have toppled
you couldn't have toppled
they couldn't have toppled	I couldn't have been toppling
you couldn't have been toppling
he couldn't have been toppling
we couldn't have been toppling
you couldn't have been toppling
they couldn't have been toppling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I topple?
could you topple?
could he topple?
could we topple?
could you topple?
could they topple? 	could I be toppling?
could you be toppling?
could he be toppling?
could we be toppling?
could you be toppling?
could they be toppling? 	could I have toppled?
could you have toppled?
could he have toppled?
could we have toppled?
could you have toppled?
could they have toppled? 	could I have been toppling?
could you have been toppling?
could he have been toppling?
could we have been toppling?
could you have been toppling?
could they have been toppling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I topple?
couldn't you topple?
couldn't he topple?
couldn't we topple?
couldn't you topple?
couldn't they topple? 	couldn't I be toppling?
couldn't you be toppling?
couldn't he be toppling?
couldn't we be toppling?
couldn't you be toppling?
couldn't they be toppling? 	couldn't I have toppled?
couldn't you have toppled?
couldn't he have toppled?
couldn't we have toppled?
couldn't you have toppled?
couldn't they have toppled? 	couldn't I have been toppling?
couldn't you have been toppling?
couldn't he have been toppling?
couldn't we have been toppling?
couldn't you have been toppling?
couldn't they have been toppling?